8 Essential SQL Constraints You Need to Master for Data Integrity and Reliability

SQL Constraints are the principles that are applied to table columns to confirm data integrity and uniformity within a relational database

The NOT NULL constraint is the one that makes sure a column has a value for it and cannot be NULL

The UNIQUE constraint is the one that makes sure column values are all different

The PRIMARY KEY constraint is a column that, when combined with the other columns in a table, collectively forms a group of columns with each row unique

The FOREIGN KEY constraint is utilized to associate two tables

The CHECK constraint makes it possible to provide a condition for the values in a column

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